<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<input type="text" id="i1" placeholder="姓名">
<input type="text" id="i2" placeholder="工资">
<input type="text" id="i3" placeholder="工作">
<input type="button" value="添加" onclick="f()">
<table border="1">
  <caption>员工列表</caption>
  <tr>
    <th>姓名</th><th>工资</th><th>工作</th>
  </tr>
</table>

<script>
  function f() {
   let tr = document.createElement("tr");
   let td1 = document.createElement("td");
   let td2 = document.createElement("td");
   let td3 = document.createElement("td");
   let i1 = document.querySelector("#i1");
   let i2 = document.querySelector("#i2");
   let i3 = document.querySelector("#i3");
   td1.innerText=i1.value;
   td2.innerText=i2.value;
   td3.innerText=i3.value;
   tr.append(td1,td2,td3);
   let table = document.querySelector("table");
   table.append(tr);
  }
</script>
</body>
</html>